/*
 * [New BSD License]
 * Copyright (c) 2011-2012, Brackit Project Team <info@brackit.org>  
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Brackit Project Team nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.brackit.xquery.node;

import org.brackit.xquery.QueryException;
import org.brackit.xquery.atomic.AnyURI;
import org.brackit.xquery.sequence.BaseIter;
import org.brackit.xquery.sequence.LazySequence;
import org.brackit.xquery.xdm.Collection;
import org.brackit.xquery.xdm.Item;
import org.brackit.xquery.xdm.Iter;
import org.brackit.xquery.xdm.Node;
import org.brackit.xquery.xdm.Stream;

/**
 * 
 * @author Sebastian Baechle
 * 
 * @param <E>
 */
public abstract class AbstractCollection<E extends Node<E>> extends
		LazySequence implements Collection<E> {
	protected String name;

	public AbstractCollection(String name) {
		this.name = name;
	}

	protected AbstractCollection(AbstractCollection<E> collection) {
		this.name = collection.name;
	}

	@Override
	public String getName() {
		return name;
	}

	@Override
	public AnyURI getDocumentURI() {
		return AnyURI.fromString(name);
	}

	@Override
	public Iter iterate() {
		return new BaseIter() {
			Stream<? extends Node<?>> docs;

			@Override
			public void close() {
				if (docs != null) {
					docs.close();
				}
			}

			@Override
			public Item next() throws QueryException {
				if (docs == null) {
					docs = getDocuments();
				}
				return docs.next();
			}
		};
	}
}